Mouthpiece



FIG. 1 is a front view of the mouthpiece device of the presentinvention;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a top view thereof.

The ornamental design for a "mouthpiece", as shown and described.